On Sat, Sep 30, 2006 at 12:48:17PM +0200, Denny Schierz wrote:
> hi,
> 
> Burke Almquist schrieb:
> 
> > You really don't want to share user accounts like that. If you don't  
> 
> what speaks against setups like these? It works under windows since
> years (without using roming profiles). I searched a while for kiosk
> setups, but most are not very usable for schools.

This is because, for years, there were no real concept of "separate,
distinct" users under windows.  Up until XP, even when you "logged in"
as a user, there was no real concept of "being that user", you had
simply mounted some network resources, and were using some profiles.

Unix, and by extention, Linux, come from a true multiuser background.
When a user launches Firefox, lock files are created, shared memory
segments are locked, etc., all in the name of that user.  Logging in
again will result in finding necessary resources already
allocated/locked by the previous instance of the login.

In short: Linux's security model is set up so that for many programs,
only one userid should be logged in at a time.

As well, there's the issue of finding out who's doing things wrong.  If
you have 50 terminals, all of them logged in as "guestuser", and one of
them is doing something they shouldn't (downloading naughty pictures,
downloading copyright infringed music, etc), how are you going to tell
who it is?

Separate people: separate id's.  It's a pretty fundamental tenet of Unix
security.

Scott

-- 
Scott L. Balneaves | "Looking beyond the embers of bridges glowing behind us
Systems Department |  To a glimpse of how green it was on the other side..."
Legal Aid Manitoba |    -- Pink Floyd "High Hopes"

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